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    <title>vue小知识点</title>
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1.淘宝镜像：npm install -g cnpm --registry=https://registry.npm.taobao.org(可以输入 cnpm -v 查看是否安装成功)
2.安装路由：npm install vue-router --save-dev
3.绑定多个class：<div :class="[classA,classB]"></div>
 -->
 <!-- 
1.component组件：引入组件，用法components: {'cartbutton':cartbutton,'pingjia':pingjia,}
2.
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